Okay, version 2.311 is @ extras-devel. It has now simple command line tool for scheme conversion bundled with it.

Just open xterm and type "convertplastic" (without quotes) and hit enter. It will give you guides on how to do the conversion. Make sure you are running the command as regular user, not root (don't type sudo gainroot or anything before the command).

This version will also not delete your Plastic Setup settings during installation.